Milk transition to a cup

[Babypigeon]

I had this issue with my daughter she was still having her bedtime milk in a bottle, she was drinking other drinks from a cup but didn't like milk from a cup and then stopped drinking it at bedtime. My son is now at the age and again he can drink from a cup but may not have his milk.

Any tips as I'd like him to continue his milk it's definitely more of a bedtime routine for him.